Inductive Speed Sensor IA-C

This sensor is designed for incremental measurement of rotational speed (e.g. crankshaft or wheelspeed).

The inductive sensor consists of a bar magnet with a soft magnetic pole pin supporting an induction coil with two connections. Every time a ferromagnetic ring gear turns past this sensor, it generates a voltage in the coil which is directly proportional to the periodic variation in the magnetic flux. The rotational speed is reflected on a periodic interval between the voltage’s zero transition points.

It is available in a DR-25 sleeve with various connector options.

The main benefit of this sensor is the combination of a high quality production part and robust, compact design.


  • Temp. range: -40 to 130°C
  • Air gap: 0.8±0.3 mm
  • Bore diameter: 18 mm
  • Weight w/o wire: 40 g




Max. frequency

≤ 15 kHz

Target wheel air gap AG

0.8 ± 0.3 mm

Operating temp. range (sensing head)

-40 to 130°C

Storage temperature range

-40 to 100°C

Max. vibration

800 m/s2 max. 80 h

Technical Specifications

Mechanical Data

Magnetic pole


Bore diameter

18 mm

Tightening torque

8 Nm

Weight w/o wire

40 g

Installation depth L2

23.7 mm

Electrical Data

Coil resistance

860 Ohm ± 10 %

Inductance max.

370 mH ± 15 %

Output voltage max.

200 VP-P


Target wheel diameter D

160.43 mm

Thickness t

> 5 mm

Width of teeth b1

4.1 mm

Width of gap b2

4.3 mm

Depth of teeth h1

3.5 mm

Depth of teeth h2

1.75 mm

Number of teeth


Connectors and Wires


1 928 404 227

Mating connector

3-pole Compact

D 261 205 335-01

Pin 1


Pin 2


Pin 3


Various motorsport and automotive connectors are available on request.

Please specify the required wire length with your order.

Installation Notes

The inductive speed sensor IA-C is developed for wheels made of ferromagnetic material.

If a wheel with different dimensions is used (see Environment), the technical function has to be tested individually.

Please contact our technical consultancy for more information.

Please find further application hints in the offer drawing at our homepage.

The inductive speed sensor IA-C is developed for wheels made of ferromagnetic material.

Safety Note

The sensor is not intended to be used for safety related applications without appropriate measures for signal validation in the application system.

Ordering Information

Inductive Speed Sensor IA-C

Order number: 0 261 210 136